Well, I mean, specifically what kind of technology?
I don't know if Ceretis has unveiled his brilliant FTL system. Basically we have jump machines that distort space to travel distances. But the machine affects gravitational bodies around it, so you cannot spacejump inside a solar system, but only between systems.
Anyway, I'm thinking warfare would be based not on lasers but on guided missiles and bullets. You could have a red-hot bullet that sears right through an unprotected hull; it's cheaper than a missile and cannot be guarded against. A guided missile, meanwhile, would be more accurate, but it can be countered by chaff and flares.
As for planetary defenses, if we're playing a single Earth Federation, we could have an orbital chain of defensive satellites that neutralizes any threat to the planet.
Terrorists could try to hijack comets and asteroids and steer them towards the planet, like in Gundam 0079.